diff --git a/README.md b/README.md
index 2c1718c..3b287bf 100644
--- a/README.md
+++ b/README.md
@@ -23,10 +23,10 @@ openssl req -x509 -newkey rsa:4096 -keyout key.rsa -out cert.pem \
     -days 3650 -nodes -subj "/CN=example.com"
 ```
 
-4. Run the server. The command line arguments are `agate <address:port> <content_dir> <cert_file> <key_file>`.  For example, to listen on the standard Gemini port (1965) on all network interfaces:
+4. Run the server. The command line arguments are `agate <host:port> <content_dir> <cert_file> <key_file>`.  For example, to listen on the standard Gemini port (1965) on localhost:
 
 ```
-agate 0.0.0.0:1965 path/to/content/ cert.pem key.rsa
+agate localhost:1965 path/to/content/ cert.pem key.rsa
 ```
 
 When a client requests the URL `gemini://example.com/foo/bar`, Agate will respond with the file at `path/to/content/foo/bar`.  If there is a directory at that path, Agate will look for a file named `index.gemini` inside that directory.  Currently, Agate sends all responses with the `text/gemini` MIME type.  (Support for other MIME types may be added in the future.)
diff --git a/src/main.rs b/src/main.rs
index 1ead233..b727b87 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -45,6 +45,7 @@ lazy_static! {
     static ref ARGS: Args = args()
         .expect("usage: agate <addr:port> <dir> <cert> <key>");
     static ref ACCEPTOR: TlsAcceptor = acceptor().unwrap();
+    static ref BASE: Url = Url::parse(&format!("gemini://{}", ARGS.sock_addr)).unwrap();
 }
 
 fn args() -> Option<Args> {
@@ -87,8 +88,17 @@ async fn parse_request(stream: &mut TlsStream<TcpStream>) -> Result<Url> {
     let mut stream = async_std::io::BufReader::new(stream);
     let mut request = String::new();
     stream.read_line(&mut request).await?;
-    let url = Url::parse(request.trim())?;
-    eprintln!("Got request for {:?}", url);
+    let request = request.trim();
+    eprintln!("Got request for {:?}", request);
+
+    let url = if request.starts_with("//") {
+        BASE.join(request.trim())?
+    } else {
+        Url::parse(request)?
+    };
+    if url.scheme() != "gemini" {
+        Err("unsupported URL scheme")?
+    }
     Ok(url)
 }